I need your help as I got some issue with wp-signup.php page which I try to resolve but I am not able to do it.

Issue is as follows,

I want to replace the text 'Get your own %s account in seconds'
with 'Fields with an asterisk will be shown on your website for the
world to see'.
I know that i can do it by going to the wp-signup.php page and hardcode the text in signup_user() but i want it to be handle with the help of a plugin so that even if wordpress upgrade then this will not affect the text.

I want to remove radio button with label (Just a username, please.) from the signup_user()